188 



Report on Trials of Plows. 



passed; c d is the inner edge of the slice; g h is the sole of the 

 furrows, and ih^lm are slices which have been previously turned 

 over. 



I^lff. 96. 



The exact mechanism of the rotation of the slice is clearly 

 illustrated in Fig. 97. Let abed represent the transverse section 

 of a furrow slice nine inches wide and six inches deep, which it 

 is proposed to raise. The point of the plow enters at the point 

 d; as nothing is cut or broken before it, it must necessarily take 

 a greater strain and sustain a greater amount of abrasion than any 

 other portion of the implement. The entrance of the point gives 

 an upward tension to the slice, which facilitates the action of the 



horizontally cutting edge of the feather, which severs the slice at 

 the bottom from the sole, d c, as it advances forward; at the same 

 time the slice is raised from its centre, c, and the outer and under 

 corners traverses the arc of a circle, d eg k. The parallelogram, 

 c e sf, shows the position of the slice when the point d has been 



